US3775033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating platen press
Assignee: Dieffenbacher GmbH and Co KG
•
Filing: 1971-07-21
•
Granted: 1973-11-27
•
Expires: 1991-07-21
Abstract
Abstract Heatable single or multilevel platen press for manufacturing wood and fiber composition panels or the like includes a stationary base structure and a displaceable structure, each of the structures being composed of a plurality of individual bridge members and rib members interconnecting the bridge members and forming conjointly therewith a grid extending over the entire width of the press, press platens loosely mounted on the grid at the workpiece-side therof, the rib members having fluid circulation passages therein for equalizing longitudinal thermal stresses, and the bridge members having fluid circulation passages therein for equalizing transverse thermal tensions, the passages of both the rib and the bridge members being connected into at least one close circulatory loop, and at least one pump connected in the circulatory loop for circulating fluid medium therethrough.
Inventors
- 👤 H Pfeiffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:23
CPC Classifications
B; B29; B29C; B29C35/00; B29C35/007; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B27N3/203; B30; B30B; B30B15/00; B30B15/06; B30B15/062; B30B15/064
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
153 words
Single or multilevel heating platen press for manufacturing wood and fiber composition panels or the like comprising a stationary base structure and a displaceable press structure, each of said structures including a plurality of individual bridge members and rib members interconnecting said bridge members and forming conjointly therewith a grid extending over the entire width of the press, press platens loosely mounted on said grid at the workpiece-side thereof, said press platens having fluid circulation passages therein, said passages being connected respectively to at least one heating and cooling circulatory loop, said rib members having fluid circulation passages therein for equalizing longitudinal thermal stresses, and said bridge members having fluid circulation passages therein for equalizing transverse thermal stresses, the passages of both said rib members and said bridge members being connected into at least one closed circulatory loop and at least one pump connected in said circulatory loop for circulating fluid medium therethrough.
Claim 2
Dependent Claim
153 words
Single or multilevel heating platen press for manufacturing wood and fiber composition panels or the like comprising a stationary base structure and a displaceable press structure, each of said structures including a plurality of individual bridge members and rib members interconnecting said bridge members and forming conjointly therewith a grid extending over the entire width of the press, press platens loosely mounted on said grid at the workpiece-side thereof, said press platens having fluid circulation passages therein, said passages being connected respectively to at least one heating and cooling circulatory loop, said rib members having fluid circulation passages therein for equalizing longitudinal thermal stresses, and said bridge members having fluid circulation passages therein for equalizing transverse thermal stresses, the passages of both said rib members and said bridge members being connected into at least one closed circulatory loop and at least one pump connected in said circulatory loop for circulating fluid medium therethrough.
Claim 3
Dependent Claim
27 words
Heating platen press according to claim 1, including relatively thick insulating layers interposed between said bridge members and said rib members in contact with said press platens.
Claim 4
Dependent Claim
51 words
Heating platen press according to claim 1 wherein each of said structuRes has a neutral plane, said circulatory loop extending sinuously about said neutral plane, and said fluid circulation passages being made up of bores formed in said bridge members and said rib members, and including connecting lines interconnecting said bores.
Claim 5
Dependent Claim
58 words
Heating platen press according to claim 1 wherein said fluid circulation passages are made up of bores formed in said bridge members and said rib members, said bores being interconnected serially and being traversible by the fluid medium in a direction from those bores thereof located adjacent said press platens to the bores thereof located more distant therefrom.
Claim 6
Dependent Claim
50 words
Heating platen press according to claim 1, including at least one three-way mixing valve connected in said closed circulatory loop for controlling the flow of the fluid medium therethrough so as to adjust heat distribution in said structures and consequent thermal expansion of said bridge members and said rib members.
Claim 7
Dependent Claim
40 words
Heating platen press according to claim 1, including congruent relatively thin heat-reducing grids interposed between said press platens, on the one hand, and the respective structures, on the other hand, said heat-reducing grids being formed with a plurality of bores.
Claim 8
Dependent Claim
52 words
Heating platen press according to claim 1 wherein said fluid circulation passages of said bridge members are formed of bores extending completely across said bridge members and partial bores extending partly across said bridge members at at least one side thereof, all of said bores being interconnected in said closed circulatory loop.
Claim 9
Dependent Claim
25 words
Heating platen press according to claim 3 wherein said connecting lines are formed of vertical bores located at a marginal side of said bridge members.
References Cited (Backward Citations)
US2699325A
Cited
GB714544A
Cited
US2821748A
Cited
DE1033223B
Cited
US2874751A
Cited
US2973790A
Cited
GB1048767A
Cited
US3291189A
Cited
US3396783A
Cited
US3685932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |